Programmable Superconducting AC Machine (PSAM)

可编程超导交流电机 (PSAM)

基本信息

批准号：
EP/J500756/1
负责人：
Timothy Coombs
金额：
$ 23.44万
依托单位：
University of Cambridge
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2011
资助国家：
英国
起止时间：
2011 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FJ500756%2F1
关键词：
Programmable Superconducting AC Machine PSAM

项目摘要

The magnetic circuit design is fundamental to the success of the final solution. To reduce the risk of developing the superconducting enabling technology the demonstrator design will be based on using standard magnetic steels and geometry architectures to achieve a doubling of the air-gap flux density. Some magnetic materials characteristics are known at cryogenic temperatures but the availability of particular key data such as ac electrical, Curie point and saturation flux density is very limited. The University of Cambridge will initially support the project by directing the selection of the most suitable conventional magnetic steel for use in the demonstrator, along with guidance on unidentified material data for use in modelling the demonstrator performance. The optimisation of magnetic materials is key to enabling the full benefits of a totally superconducting machine to be realised. For the programmable magnets the main challenges are the optimisation of the Currie and saturation point of the materials and how this impacts the preferred charging cycle and the actual magnet operating temperature. This in turn directs the preferred location of the magnetising jig. A significant challenge to an optimum magnetic material has been identified as the quality of the manufacturing process, heating treatment and the chemical composition of the material. The chemical composition affects the Curie temperature and the charge carrier density. The heat treatment profile affects the diffusion of the ions into the oxygen lattices and the manufacturing method affects the homogeneity and uniformity of the material. For the superconducting stator the main challenges are maximising the flux linking the superconducting coil by creating a low reluctance path. The prevention of flux leakage that will reduce both the flux linkage and the operating point of the superconductor can be achieved using a high permeability material. Although Proposal original proforma documentPage 3 of 9 Date printed: 16/02/2011 09:39:22TS/J001082/1 Date saved: 15/02/2011 15:49:48extremely limited mechanical, thermal and magnetic material property data currently exists at the cryogenic temperature of interest 25K, it has been observed that the use of iron at cryogenic temperatures has yielded benefits for dc superconducting magnets. However, for cryogenic ac magnetic systems, this convention needs to be re-visited. The ability of magnetic material to provide a low reluctance path whilst providing very low loss densities will need further consideration. There is a significant risk that conventional steels at cryogenic temperatures will incur significant eddy current losses (due to the increased electrical conductivity) and higher hysteresis losses leading to an impractical cryogenic solution. The loss density, thermal and magnetic performance as a function of frequency of a range of magnetic steels needs to be understood. Work should also consider alternative non-conventional room temperature materials that may also exhibit enhanced permeabilities at cryogenic temperatures. This work by its nature must also consider the long-term stability of the material under thermal and mechanical stresses. It is likely that the result of this study may lead to different machine constructions such as the location of the permanent magnet fixture jig, the cooling circuit construction and the overall machine topology such as an inside machine to be considered. This work will used to guide the full-scale outline design.

磁路设计是最终解决方案成功的基础。为了降低开发超导启用技术的风险，演示器设计将基于使用标准磁性钢和几何体系结构来实现气隙通量密度的两倍。某些磁性材料特性在低温温度下是已知的，但是特定关键数据的可用性，例如AC电气，Curie点和饱和通量密度非常有限。剑桥大学最初将通过指导最合适的常规磁性钢的选择，以及有关示威者使用的最初支持，以及有关未识别的材料数据的指导，以用于建模演示者的性能。磁性材料的优化是实现完全超导机器的全部好处的关键。对于可编程磁铁，主要挑战是材料的咖喱和饱和点的优化，以及这如何影响首选充电周期和实际磁铁工作温度。这反过来指导了磁化夹具的首选位置。对最佳磁性材料的一个重大挑战已被确定为制造过程的质量，加热处理和材料的化学成分。化学成分会影响居里温度和电荷载体密度。热处理特征会影响离子扩散到氧晶格中，制造方法会影响材料的均匀性和均匀性。对于超导定子，主要挑战是通过创建低不情愿路径来最大化连接超导线圈的通量。可以使用高通透性材料来预防磁通量泄漏，从而减少磁通连接和超导体的工作点。 Although Proposal original proforma documentPage 3 of 9 Date printed: 16/02/2011 09:39:22TS/J001082/1 Date saved: 15/02/2011 15:49:48extremely limited mechanical, thermal and magnetic material property data currently exists at the cryogenic temperature of interest 25K, it has been observed that the use of iron at cryogenic temperatures has yielded benefits for dc superconducting磁铁。但是，对于低温交流磁系统，需要重新审查该惯例。磁性材料提供低不情愿路径的能力，而提供非常低的损耗密度将需要进一步考虑。有很大的风险是，在低温温度下的常规钢将导致明显的涡流损失（由于电导率的增加）和更高的磁滞损失导致不切实际的低温溶液。需要了解损耗密度，热性能和磁性性能作为一系列磁性钢的频率的函数。工作还应考虑替代性的非规定室温材料，这些材料也可能在低温温度下表现出增强的渗透率。这项工作本质上还必须考虑材料在热应力和机械应力下的长期稳定性。这项研究的结果可能会导致不同的机器构造，例如永久磁铁夹具的位置，冷却电路结构和整体机器拓扑，例如要考虑的内部机器。这项工作将用于指导全尺寸轮廓设计。